Insulin resistance

Unexplained weight gain and persistent difficulty losing weight, despite genuine dietary effort and physical activity, are among the most common and most mismanaged presentations in contemporary medicine. The prevailing clinical narrative, that excess weight is the result of consuming more calories than are expended, is reductive to the point of being clinically misleading. It ignores the complex hormonal, metabolic, and biological machinery that governs fat storage, appetite regulation, and energy expenditure, and it leaves patients who are struggling with an unsatisfying and inaccurate explanation for a condition that has identifiable, treatable biological causes.

Insulin resistance is among the most significant and prevalent of those causes. It is a state in which the body's cells become progressively less responsive to insulin, the hormone responsible for facilitating glucose uptake and energy storage. As insulin sensitivity declines, the pancreas compensates by producing more insulin, and elevated insulin levels promote fat storage, inhibit fat burning, drive appetite particularly for carbohydrates and sugar, accelerate inflammation, disrupt hormonal signalling, and impair metabolic flexibility. It is a self-reinforcing cycle, and it cannot be broken by caloric restriction alone.

At The Schoeman Clinic, we investigate weight and metabolic health comprehensively, identifying the specific hormonal and metabolic drivers of your difficulty, and developing a personalised treatment programme that addresses those drivers rather than simply asking you to eat less.

Insulin resistance arises from the interaction of genetic predisposition with lifestyle, dietary, hormonal, and environmental factors. It is not exclusively a condition of those with excess weight; lean individuals can and do develop significant insulin resistance, and its presence at a lean body weight is a common source of diagnostic misidentification.

Dietary patterns high in refined carbohydrates and ultra-processed foods promote chronic hyperinsulinaemia, the sustained elevation of insulin that progressively impairs cellular insulin receptor sensitivity. Physical inactivity reduces glucose uptake by skeletal muscle and promotes visceral adiposity. Chronic stress elevates cortisol, which raises blood glucose and directly impairs insulin sensitivity. Sleep deprivation produces measurable insulin resistance within days through its effects on glucose metabolism and appetite-regulating hormones.

Hormonal imbalances, including thyroid dysfunction, adrenal dysregulation, oestrogen deficiency in perimenopausal and menopausal women, and testosterone deficiency in men, all contribute to metabolic dysfunction and make weight management significantly more difficult in ways that are not addressed by dietary intervention alone.

Gut microbiome dysbiosis is an increasingly recognised factor in insulin resistance and metabolic disease. Specific microbial communities influence energy extraction from food, short-chain fatty acid production, systemic inflammation, and intestinal permeability, all of which affect insulin sensitivity.